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improving RX antennas?
#1
Hi, here's something I've been wondering for a while. Can I do a little antenna modding to RX's to improve their range/reliability? 

First off, here's a picture of three receivers I have. Let's number top to bottom (ie black, orange, black) #1, #2 and #3.
[Image: uzMqP5C.jpg]

On a bit of a side note we can see that the antennas on #1 and #2 are separated by 90 degrees which I believe should be better because then it matters less at which angle the quad is to the TX because the RX will choose the strongest signal. Is this correct? Would it then help to resolder one of the antennas on #3 to be at straight angles with the other?

Antenna length. All three RX's have antennas of roughly 3,1242cm, which is a quarter wavelength of 2.4Ghz. Could I improve the range by soldering on antennas of half or full wavelength?

One more question which I hope I can ask in an understandable manner. I've seen some RX's with what looks like a shielded lead as to have the sensitive part of the antenna be moved away from the RX hardware a bit. As an example see this RX on Banggood:

[Image: RKxtKDM.png]

Here's a few annotations:
[Image: o74fIWb.png]

Am I correct in thinking that the shielded part is not counting as the antenna length, but that we should start counting the antenna length where the shielding stops? I'm assuming that the shielding needs to be grounded. If this is the case, I'm wondering if I can mod my RX's from the top pic to have longer leads and possible a shielded middle part, so that I can have the antenna sticking out of the quad, away from other hardware.

Looking forward to your replies. It feels like a noobie question but hopefully there's others wondering the same thing. Thanks!
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#2
What You have is a simple antenna - a single wire tuned to 2.4 frequency. Longer wires on 2.4 are partially (mostly) shielded and the part that "works" is unshielded.

You can try to solder something like this on (just chop the connector): http://www.aliexpress.com/store/product/...27468.html
so You can place active part of Your antennas away from other hardware so it won't be obstructed. Yes - shielding has to be grounded.

What You see on ia6b is a dipole antenna so if I understand that correctly makes it a half-wave antenna. Don't know ifr I'm wrong, but have some experience in flying that exact RX with a dipole on and later - with outer part removed (quarter wavelength). In original state I never had a failsafe scenario, whilst with just the wire it already dropped twice and I had a few stalls like half-a-second lack of signal on significantly shorter distance.

So... yeah, I hope that helps a bit, but also that someone with more insight into how antennas work joins this discussion.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
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#3
So, what you are saying about the fs-ia6b, I should just keep the antennas as they are and not remove the metal tube?
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#4
(08-Jun-2016, 07:59 PM)oyvinla Wrote: So, what you are saying about the fs-ia6b, I should just keep the antennas as they are and not remove the metal tube?

This is my experience with them. It's fine to use like that on my 130, but I fly a lot further with a 220 - two times failsafe kicked in when some thick trees were on the way.
Find me on Youtube and Instagram. I currently fly: DRC Aura, NOX5R, Minimalist 112 and drive a scrap RC car
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#5
That does help Konrad, thanks for clearing up my question and adding some more info.
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